It won't be. Dubai Int'l and Istanbul were both also built by their governments to be the largest in the world and are already open. Per wikipedia neither has come anywhere close to ATL so far -- 66 and 64 million as compared to 93.7 million passengers in 2022 -- although much closer than most normal airports of course.
https://en.m.wikipedia.org/wiki/List_of_busiest_airports_by_...